The scientists hope to let these miniature automatons swim through our veins and arteries fixing all manner of maladies, with cancer cells being the primary target (although mining for cholesterol is not out of the question). The robot doesn't carry any onboard power, instead relying on external magnetic forces to propel the device through the bloodstream. There's no word if the mini-bot will be equipped with lasers to fend off attacking white blood cells, because for now, the medical robot, like the above artist's rendition, is only a pipedream

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